Fix github_url when there’s no repository_url
Fix github_url when there’s no repository_url

tomnatt/libraries.io,samjacobclift/libraries.io,abrophy/libraries.io,librariesio/libraries.io,librariesio/libraries.io,librariesio/libraries.io,abrophy/libraries.io,tomnatt/libraries.io,librariesio/libraries.io,tomnatt/libraries.io,samjacobclift/libraries.io,abrophy/libraries.io,samjacobclift/libraries.io